摘要
环流抑制是逆变器可靠并联运行的关键技术,针对微电网中的共直流母线冗余并网逆变器的并联运行,提出了一种基于零序电压差补偿原理的零序环流控制方法。首先分析了并联逆变器间零序环流等价模型,根据单台逆变器的零序电流反馈量和无差拍电流控制方法直接得到并联逆变器间的零序电压差补偿量。然后通过调节该单台逆变器的零序电压使并联逆变器间的零序电压差接近零,实现抑制零序环流的目标。最后,仿真和实验结果验证了所提零序电压差补偿原理和零序环流控制方法的有效性。
Circulating current restraining is the key technology for the reliable operation of paralleled inverters. Based on the compensation principle of zero-sequence voltage difference, this paper proposed a zero-sequence circulating current control method for the redundant paralleled grid-tied inverters with common DC-bus in microgrids. Firstly, the equivalent circuit model of circulating current between paralleled inverters was analyzed, and the quantity of zero-sequence voltage compensation between inverters was obtained by the deadbeat current control method according to the zero-sequence current feedback of a single inverter. Then, the zero-sequence voltage difference between parallel inverters is close to zero by adjusting the zero-sequence voltage of a single inverter for restraining circulating current. Finally, simulation and experiment results verified the validity of the proposed control method to restrain the zero-sequence circulating current between paralleled inverters.
出处
《中国电机工程学报》
EI
CSCD
北大核心
2014年第19期3098-3104,共7页
Proceedings of the CSEE
基金
国家自然科学基金重点项目(51237003)
教育部新世纪优秀人才支持计划项目NCET-10-0367)
湖南省研究生科研创新项目(CX2013B162)~~
关键词
微网
并网逆变器
环流
零序电压
无差拍控制
microgrid
grid-connected inverter
circulating current
zero-sequence voltage
deadbeat control
